In: Operations Management
In a trucking company, terminal docks include casual workers who are hired temporarily to account for peak loads. The minimum demand for causal workers during the 7 days of the week (starting on Monday) is 20,14,10,15,18,10 and 12 workers. Each worker is contracted to work 5 consecutive days. Develop the LP model that determines an optimal weekly hiring practice of causal workers for the company.
Decision variables
x1 = Casual Workers starting on Monday
x2 = Casual Workers starting on Tuesday
x3 = Casual Workers starting on Wednesday
x4 = Casual Workers starting on Thursday
x5 = Casual Workers starting on Friday
x6 = Casual Workers starting on Sat
x1 = Casual Workers starting on Sunday
Objective Function
Minimize Z = (x1 + x3 + x3 + x4 + x5 + x6 + x7)
Subject to
x1 + x4 + x5 + x6 + x7 >= 20
x2 + x5 + x6 + x7 + x1 >= 14
x3 + x6+ x7+ x1 + x2 >= 10
x4+ x7 + x1+ x2 + x3 >= 15
x5 + x1 + x2 + x3 + x4 >= 18
x6 + x2 + x3 + x4 + x5 >= 10
x7 + x3 + x4 + x5 + x6 >= 12
x1 > = 0 , x2 >= 0 , x3 >= 0 , x4 >= 0 , x5 >= 0, x6 >= 0 , x7 >= 0
Solution
Formula
Solver